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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dc379a4a735674bd1bba15dfdffce8327d2abfbe5e747bca0c367a863993ad' 
  AND token = '6IKpxkQ0ha8DU6seozVn9UhYO5pw7kNcmA3yvM/k3yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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