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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94f6e25e38a0f0cab6746394efef1fca115aa8d9399d82ca30d6d3dbaf37815' 
  AND token = 'MTcvBzM5Oj/e0oaElJ00vTlZN69EqjsfLJnc3j6ECS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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