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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff80ba5ed3633aad550180d539a92165b8ac4835e9cb3e806932d295fb4b590' 
  AND token = '5amdd0Y/pjM82tRkN2hidRO1cuYfHO/9bp+SOAGLQGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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