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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071cb6c2919b3cf4b0291e3f6fb191d4cce33af60324ff78e4c5befa6538663d' 
  AND token = 'GZxL/NL7tigoYcWq9Fq5WcVPaAZSl8WIJsykqVp7YyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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