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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1d2b8580a665f3a5fc76ca867f42caedbf8d76b8567d1dd0563896af0bb2e1' 
  AND token = 'LDIkX+iM2135eKqJJt3twa9YXa/tjY9BifDRJz7e28Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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