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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d18cf8653c03c61a22da332c13418a85aa90caef4cd4a5c36b6f57062db89f4' 
  AND token = 'pekpwAxY5ysGF8SHNnDe7N/OJgZrRc/yj1NLPINxxKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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