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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db0f5544ded2236831fb9a9fcecac9c1cf8a860f586ff583b205d30b0a4a72d' 
  AND token = 'c+cXIJXiCnGIF5p21mdN4j18HR1rbSdlij9K0VwwRUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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