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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5c09330649df3dd45226f1d1c6598ec64b714cbe05644b85535bb5b028e87b' 
  AND token = 'Nezz9Ueh0M9Rbes0p5RngTF0kod07PVCH7NIAJ+46F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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