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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ffe7ef7e35fb96f170f4f6e8be7e7013a9f9790d6d9c0bf89a9610bac6ecc' 
  AND token = '2kpxyY8VmBBy6M7mJXmgZT27Hg5w9Hypj94KkMcQdjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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