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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c508d5aea5fb3e29df888b95b2ea41bbb9ad8d2eae94ca3a6c85d83b0838f8f' 
  AND token = 'YI1acqS9p0DIsrFOnlTuddOkoeZf5m4tNccl0yxj2Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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