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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73178ffe66e18f098ecdfb27b6828c096e3a4e3aba5c1ad04ea4c7422c77739a' 
  AND token = 'HSSB2j9WT0E6ZPqk9wGzRYelckO7cosL1VHsMXcHxIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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