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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1319eb452803df06ad4d8edc46fdc1453c83266728c2d3c039f75d95f7d13cb5' 
  AND token = 'aBkwQjH7W9ulg8VR90F+aboaP0f+mHkYAUyhQ2mxF8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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