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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafc0ae62e90e7611b1d849188ad54a5717dbd9c7171ebda0d67bf24c678a7ac' 
  AND token = 'PLrWbcqviCh7+DCMeNkeRoiXQ8lcClwI1nj5/PgK2fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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