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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bbbc4ea2491518e45817a4dbdc1c9b3e690b6916f3fdc367ac636240da07d9' 
  AND token = '1i28CxGiHf1zeyZPTMv4LMYh44BihSsfm5AyrvpOnVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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