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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd087527dab3c21820c8f2bd2c2e6daf8d52c6763ca78d729477755f6630cad88' 
  AND token = 'aF8cjZWPTBn6oTeEC05dovCAKu2BvahOmauH+E0CiYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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