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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ee37e19617f6247058ccc56053fc94987ef8ee0fb526ef00aecbb111a08477' 
  AND token = 'Cwl/AgWX75sxev3Dh6YOTG4quBr3WnyJrWZzrbKkZWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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