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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ecc737107e68169656de7a7da7a7d234fadaec71a6decb6233f13735163f0e' 
  AND token = 'OeS9DIkwG76y0/Obe7aDvmsm1u7lpya8gt6DMbkgqjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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