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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd364b4cb46e045900e755d67b8e6b9dc4ee9af74f0d7e846868698dd9d0a88e' 
  AND token = 'fER0myhXz3246m3BLey1O8PfK37vxf0dcV/PJP0fJ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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