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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f2bbb2ffa56c950cd6121be3a31e1796bd471fee0986b2bf41a1f1f4b5fd5a' 
  AND token = 'zrH2iKXaNVJvX80EvH/873qa4rFy9dSO0eAUYIlLVkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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