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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2041bfd9582fc50376ea3d4e31d7b1f94c0ce88767e0c431f293a1fb23f316c' 
  AND token = 'yPHVI0yVq49muTf5cNHdf5KiUtzcs1jMz3JywoPP8KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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