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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7f91159b21b63fb2ee09a972f9937eca99f011016764e5fa408aba846271e0' 
  AND token = '1s57aXOhueBQ8J7qPGNSL1MWY1KGSI/dRJIAXbTG2/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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