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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808552a2690a68e310a294bad834616a18cf37daf74a43147586cb7291fe551a' 
  AND token = 'Nuz3xz+/Jp+woNuiber8En7U5k7oHGj/BD5jD7VVaTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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