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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd262624600bd58b51cc1dae14e3f68a1cdaa16e3ffe604f8e9ca01361877ff3a' 
  AND token = '17M6NtXwGSZHqtbRxDfW97ahjmr98mVTcLHHuZhMFrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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