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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1740114c55390750e4712ec9b9ca34a1f0a9520613c065b9f78b38e9b6538b88' 
  AND token = 'XV56SLbEDn8Jz1/OuCtE2ovic3LP45QdCfUtd7j6O/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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