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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff82e2e62366395b6f0b15e327ea9a3f26eff41bddc37b3008ef37e0ae19c42f' 
  AND token = '/W1a4dbRjJ07r1AhogyCdAMoGLwSqmn+UmHe/INqsOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}