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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f877d4989646973d6bcc6fe02314622dcca890dcbebd927d63d667eb934448b' 
  AND token = 'XMWkZG9PNJ3sfNsN/x/nQVS3L83HQxMX7HL9gO337pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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