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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d206d80e3a9de84c7454750b810dcc67d08e390f15042a28301b87e0f3d629' 
  AND token = 'q2Z2vKWN5OvVcriJVfDDNZnIJlnGlZ29Grqf1RJov9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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