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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264ee743556f3c2c0f620c48627ff107561a52ad78dcec775b8f776df6039b5c' 
  AND token = 'dNTClaljrqT4F1lfgvPSEI0MV03KXrnk5Ieqyad5RH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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