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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cbcbe85f5e2aca707889ef8e3436e8424537f7d3b55e536f3a0d76a07dcf67' 
  AND token = 'HzSOLrcF96mD+ld0vV0yWn47TN96gIC/9+N/+8WCx28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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