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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5db810430d562e9044bae1a98a145f1a8ed2d175e31529c0b29c102c47bc20' 
  AND token = 'ph56YX4ytmwviVDrNje5cpotp36vZKYScUYppxgLV0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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