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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebf99b8ec47251f0c3db23c06b9bb4dd5dc347030d30a10a831ef3ed95c612d' 
  AND token = 'IBZ7HTOytPCSgPpYRnhGpSvOqOh1xHOJwRabRxFgqM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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