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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88476d2d0abf40246e562894664f8d6bd4b954ad038411e52aec904b93411a60' 
  AND token = 'sYP5YVAEMkOPyS0a/TZvG6ULRv9+CXq9q5k61ZcxzN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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