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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4993e7db30b7d8e7f52630afd1466dcb860bb080bc7efe9882505468cc6a8b' 
  AND token = '4VrRpP4AUq/wv50urbeltfYuWP2TKGHmpKOBb8Uj4tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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