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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08800ca87cfd43713ef11c482eaed97fe0a8a796b606a6280203045bbba1e1b7' 
  AND token = 'NZlrbMmuivwCg+Vd16dr6dUOiGu1JzXV3ahyfDKjEd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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