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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0330bfad7cce4ac071c5fbb9472939356e89edf2604aac35f83e251205ed822d' 
  AND token = 'Lop3YdFpIo7GME6I5g9l0t87FplK8hgiAZHvzGnooHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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