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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9029b2e6c0e25799d8366fcadef0a1d31d4a83a0a27bd0f99b7d2c7b4c18e7d8' 
  AND token = 'a/IEPNLWILEpbTs+VQbLqXXUZjimww5qy0zl2xsHScs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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