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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedee70f0cc2b044523ea6c43667609a9aa6c362b0d99edb5977e0a9c8b88099' 
  AND token = 'k+LznlCrXRum3WmKazyfxNtb1x18JO8vAq3M9udPcXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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