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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bf16d19238910306e9995db63b7dffa70b5007f68ca2d5c21590a554211b9a' 
  AND token = 'AOvW9KnJsOqYLJhoj6FAxM7xn+gUaq43/ndK54iJoeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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