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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c916a0b2f69e607e9d36c2ec470290cf3e1faceb00632f78caf8e0800d85a8' 
  AND token = 'UGNdw3+wQ2HWYTi3gxceBS0jviGY3j4csidhDQwSMrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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