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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b90476d0288cdbebb9a9d5ad6889b09cbca7bfd8ebd70d676669973e32ac645' 
  AND token = '+WC0X58Vt+ajY9PyC6E8e+3UxwEkNomvlnFBTjtJW8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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