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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7285d7f05d16f8aa99237b1c90f844378be8e03844a92694a1b7378c51a396a7' 
  AND token = 'l26gUMm5rctDzHymbkddZmx4vNBdR+D8FAmOK4oG/WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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