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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45c46a8000422bb5e5d8187ec95f5f5d197941c23d1de0aa4b95d827cc8cf5e' 
  AND token = 'IkEKzTWBEGNeX17ih7wyroY78cYLDXaWRk+ZnpaHV/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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