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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da16d34b3b7a7463cf2a08ca03757cdf36f6ceb7ee63ebe18403f88dc2e7d66' 
  AND token = 'SiGqDjE66Vly/MG1TTLbBf69lxfWrE4Fgxt0U7SM32Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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