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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd01d354c9db8c13823e10f0cb3139e1eb223b8201961203c9b91462ea2f796' 
  AND token = '/WVu0ji2FrjFfeSqEwdA5WZa+RFGLR7cqnJ310Ru2xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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