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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23eee785da3afb8f97f763061ee79a0e9d26866c738e9dd1d0277a578d72678' 
  AND token = 'OMcMwzhFJpd2Hg0bfFFEuLQ2+GmFvEdlV5cMq2pIJEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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