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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d1c22998dec1b91ca2ae6ab473d01ea18fc475e4f039c60caf14533cf2cc81' 
  AND token = 'mg3FcHXOWYk4N9q7jxDF0wo92NNKtSmONaN5vBaFhhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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