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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a120c985d3a45b0138769ff3c76ddd36d25110f788c90eca316c6649c88607' 
  AND token = 'Se8vd9P6xVYj0f9h3co3cUJ17YJsAWIt2jM0RwkJJ/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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