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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c05e78d5e25bbc9c8e91fc804aeefe21b8ed7fdee5a2849535c197d4b3852d' 
  AND token = '4o8mQhAV1s5hZdfsRYHoqEWtYngY603YkGphSghmGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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