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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae7f089f7535498218bc4d4c1d91c1a6f683782c2e0ec4f87d31af109a66e1f' 
  AND token = 'JdkiyWDnVaeHPnpwNYbPibPORQJKbkV8Iwd/yG0ULqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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