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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188c8041cc08bc92e9b09b54cbb956328be9e49545b9e41ded638f89b7e3868b' 
  AND token = 'WfPZCp9xzZtChKt9IfBC7W2eJELy9gyP8QlVtieWOkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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