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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2fc8551963855b097ac8a948f4acbb7deee99d75b1c605a9ee77737878bf3b' 
  AND token = 'PNrK3iv7HlnL97NXb9n5Jo5iQ7uYBo1I7lExgI5GMoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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