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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b23279b0cd9a40d5c7788efbaa0d65ee7c585c489685ed307f3855548515ce' 
  AND token = 'rXrmJNaSNl5v5WiYt5XkBLVRjDucpWvOEDyHc5fV8TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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