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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ecb0fb8b4f0b119bf002c562d80362b84ad61f6d85b4322eeb7d2293ff38ad' 
  AND token = 'ze7BwTftcFalQc3R61GHW1+yTda4lDnaBWZ/yW+4B5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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