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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2f5f5eb12020e359c088fe84b4a7d10131edb0fc39d9bda83b69e38ed51763' 
  AND token = 'eUWIDbeSdJxPPEsVpZzPEF8zJm87r/nvzgrDwhTej8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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