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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d3b674de2f4a5cdeeb8c0cd164e569d964c3ae5613c6d35cea3eec5066ea4e' 
  AND token = 'NFqhwiUg+XxUPQ6wvP7TiG63IY++LMwNVk+Fk8cWv4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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