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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d74b62c959a5ea5f0c2fd9788dffa3b07ea36c3e4b1767732fa25e0ada1e46' 
  AND token = 'IwxW6RCQ/lk22NEm97oDKfpEcb9Q/LUw6LhS1FVVsYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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