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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99431e7b9d3a78e56cea9c95440ef9b052d181c91c87ce28edfed06785f9c64d' 
  AND token = 'npdycXEMeNhGR+u/qboXZEYQsy+Tv2Sli1ru2a8GMRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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