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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43833d1abefeae344f478874078c83b59ec2b787de73774a38720a6081fbaca1' 
  AND token = 'tHKXr5xodgRi6Z/RG92Omzc0fsiO2Zo9VZq9Fyt7Gp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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