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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b881dce19f18b30e62615faa7a0856e7ee514d57c0a976f112d7abb876ca892' 
  AND token = 'p4GBVHnNsaNwqrkwhlbFD17v7aTnpDCwvffJHVQb+E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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